Does 2160 x 1080 p (18:9) affects VR ?

Ihave the choice to take a 1920 x 1080p screen or a 2160 x 1080.
The first one is 16:9 and the second is 18:9.
The question i want to ask is: Will videos, games use the little bit extra of pixel (+180) ? I want to know how it goes on VR with the 2160 resolution